Subsequent Events (Details)			12 Months Ended
	Apr. 11, 2016 USD ($) ft² item	Mar. 03, 2016	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 16, 2016 USD ($)	Feb. 25, 2016 USD ($)
Contractual facility			$ 207,075,000	$ 201,318,000
US Bank Of America Credit Facility [Member]
Contractual facility			$ 55,000,000	$ 55,000,000
Subsequent Event [Member] | Doheny Condo, Los Angeles [Member]
Sale price						$ 3,000,000
Subsequent Event [Member] | 5995 Sepulveda Blvd, Culver City [Member]
Sale price	$ 11,200,000
Area of property | ft²	24,000
Number of parking spaces | item	72
Percent of leasable area	50.00%
Reduction in headquarters occupancy cost					$ 350,000
Subsequent Event [Member] | US Bank Of America Credit Facility [Member]
Reduced leverage ratio		0.25%